default or selected kernelversion does not have config value CONFIG_FDMA.
Result is shown for kernelversion 6.12-rc1

FDMA API

modulename: fdma.ko

configname: CONFIG_FDMA

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>FDMA API
In linux kernel since version 6.1.112 (release Date: 2024-09-30)  
Provides the basic FDMA functionality for multiple Microchip
switchcores.

Say Y here if you want to build the FDMA API that provides a common
set of functions and data structures for interacting with the Frame
DMA engine in multiple microchip switchcores.

source code: